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Bat Acoustic Monitoring at Missouri National Recreational River

This bat acoustic monitoring station along the 59-mile lower reach of the Missouri River had some of the highest bat activity in the park.

NPS

Overview

Missouri National Recreational River is comprised of 69,124 acres along the Missouri River in South Dakota and Nebraska. Managed by multiple state and federal agencies, this park is divided into a 39-mile upper reach and a 59-mile lower reach. Riparian forest, wooded uplands, and prairie remnants provide good bat foraging and roosting habitat. Areas with lots of large trees and surface water have high bat activity at Missouri National Recreational River. Some bats can eat thousands of mosquitoes each night making them important for insect control in croplands along the river.

The Northern Great Plains Inventory & Monitoring Network monitors bats to detect long-term trends and to get early warning of undesirable changes in bat populations at the park. A fungal disease called white-nose syndrome is spreading quickly, threatening bat populations in North America. First documented in a New York cave in 2006, this disease is associated with more than seven million bat deaths. It spreads primarily from bat to bat and humans might be spreading the disease by carrying nearly invisible fungal spores on their shoes and clothing from one cave to another. Bat monitoring helps us understand changes occurring with the spread of this devastating diseease.

Acoustic Monitoring

Twenty-two acoustic recording stations and five mobile survey routes were established in 2014 and 2015 in the 39- and 59-mile reaches for long-term bat monitoring at Missouri National Recreational River. Acoustic recorders detect the unique ultrasonic calls bats use for echolocation. Several of the monitoring stations were on state and private land and we share results with these network partners. There were 256,687 bat call recordings from stations across all survey nights from 2014 to 2017. The data were analyzed through specialized software programs that make preliminary identifications of the bat species based on individual call characteristics, such as frequency and shape. Some bat species make calls that are similar to other species, which is why researchers with special expertise review the calls and make the final species determinations.

Hoary bats (Lasiurus cinereus) have striking white-tipped fur, and were one of the species detected at Missouri National Recreational River.

NPS/Isle Royale National Park

Bats in the Park (2014–2017)

Eight bat species were detected at both reaches at Missouri National Recreational River. Status is based on acoustic recording classifications in specialized software and researcher expertise

The threatened northern long-eared bat and the eastern red bat, an eastern species, were detected in higher numbers at Missouri National Recreational River than in other Northern Great Plains Network parks.

Evening bats, another eastern species, were present and may be expanding westward; they were not found in national parks west of Missouri National Recreational River until detections in 2017 at Niobrara National Scenic River and Scotts Bluff National Monument.

Areas with lots of large trees and surface water had the highest bat activity at Missouri National Recreational River. These areas provide good roosting and foraging habitat for bats.

The northern long-eared bat (threatened), little brown bats, and tri-colored bats are particularly vulnerable to white-nose syndrome. The latter two species have been recommended for federal listing.

The big brown bat (Eptesicus fuscus) is widespread throughout North America, and was the most commonly recorded species at Missouri National Recreational River. White-nose syndrome has not yet been detected on the park's big brown bats, but this species is vulnerable to the disease.

NPS

White-nose Syndrome

The disease has not yet been detected at the park, but in 2017, the fungus (Pseudogymnoascus destructans) that causes white-nose syndrome was detected on bats for the first time in South Dakota, west of Missouri National Recreational River, and in nearby Ponca State Park in Nebraska. See a map of white-nose syndrome in national parks and learn more about how you can help prevent the spread of this fungus. Continued monitoring, and park staff and visitor observations, will help us protect the bat communities that live and forage in the park.